Pipe joint



J. F. KHNKE Feb. 6, 1940.

PIPE JOINT Filed May s,

`Parental Feb. s, 1940 PIPE JOINT Johan Friedrich xhnke, Haai-leal,Netherlands -Application-May 3, 1938, Serial No.. 205,677

In the Netherlands July 17, 1936 2 Claims.

The present invention relates to means for jointing pipes, moreespecially such as are used for supplying gas or uid under highpressure. It

is an object of the invention to provide means for 5' jointing suchpipes by means of simple and cheap parts which nevertheless assure astrong and reliable joint.

The invention is applied to the known pipe connection in which the endsof the pipes to be connected are inserted into a socket, the spacebetween the pipes and-the socket being then filled with packingmaterial' and closed at both lends by inserting a pressure ring. Thesocket 1s formed with two axially extending slits and the pressure ringswith indenturesreg'istering with vthese slits, so that a wedge insertedinto a slit and driven into the indenture and projecting through theother slit will force the pressure ring farther into the space betweenthe socket and the pipe, thereby compressing the packing mate.

rial.

The ends of the pipes are formed with a collar, which may be fixed tothem by welding, or the ends of the pipe may be doubled-up so as to forma flange enclosing with the pipe body an .acute angle. Alternatively thecollars may be formed with a V-shaped groove on the side averted fromthe pipe ends, and rings of wedge-shaped cross section loosely embracingthe pipes may be forced into these grooves so as 'to expandthese'collars or anges against the inner wall of the surrounding socket.

In the drawing affixed to this specification and forming part thereofseveral embodiments of my invention are shown diagrammatically by way ofexample.

Inu the drawing Figs. 1, 2 and 3 are an axial section, an elevation anda cross section on the line III-III in Fig. 1, respectively illustratingthe firstv embodi'- ment. v

Fig. 4 is an axial section of a second, and

Fig. 5 a similar view of a `third modification.

Referring to the drawing and rst to Figs. 1-3,

I are the pipes, 2, the collars formed at their ends, 3 the sockets, 4the pressure rings, 5 the pairs of slits in the sockets, 6 the wedges, Tthe indentures formed in the walls of the pressure rings, 8 the ange onthe pressure rings, 9, I0 the wedge- 60 shaped rings and I I the packingmaterial.

When jointing the pipes' I, they are inserted into the socket 3, thewedge-shaped rings 9 are put into place between the pipe wall and thesocket andthe packing material Il is iilled in.

55 Now the pressure rings II are shifted into the annular gaps, thewedges are pushed through thev four pairs of slits 5 and the indentures1 formed in the sockets (Fig. 3) and driven home by hammer blows,whereby the pressure rings'are forced deeper into `the gaps, the packingmaterialis 5 compressed between the sockets and the rings 9, and therings 9 are forced into the angles or grooves of the collars, therebyforcing the collars against the inner wall of the sockets. By making thecollars 2 longer than, f. i., 11/2 times as long 10 as, the width of thegap between the pipes and the socket, any tendency of the collars 2 tobend back under the pressure of the wedge faces I0 of the rings 9results in a pressure exerted on the inner wall of the socket andconsequently in a still more eicient closing of the joint. It may bedesirable to promote this effect by making the Wedge angle greater thanthe angle enclosed between the collars 2 and the pipes. am

In order to facilitate assembling, the position of the indentures l maybe indicated on the flanges 8 of the pressure rings.

While the wedge rings 9 might also be omitted, they have -been founduseful in eliminating any disadvantages which may arise from a splittingoff of the collars 2 or from deficiencies inthe packing material.

In the embodiment shown in Fig. 4 a ring 2 secured by welding on the endof each pipe replaces the collar 2 shown in Fig. 1. AThis ring 0 may beundercut at 2, as shown in Fig. 5, whereby the same effect can beobtained in cooperation with the edge III of the pressure ring 9, aswith the doubled-up collar 2.

The joint according to the invention affords 35 the advantage that thepressure of the gas or liquid in the pipes tends to press the pipes iand rings 9 against packing II which, `however, is held back by therings 4. The higher the pres- Y sure, the stronger the packing iscompressed and the better the joint is closed.

In order to subsequently tighten up the jointf it is only necessary todrive the wedges 5 a little further into the slits.

I wish it to be understood that I do not desire to be limited to theexactdetails of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

I claim:

1. In a pipe joint in combination, a pipe having a i'ebent flangesurrounding the end of the pippe, said ange forming with said pipe agroove extending substantiallyparallel to thepipe wall, a

' packing ring of wedge-shaped cross-section projecting into the groovebetween said pipe and to be joined together and means for forcing saidwedge-shaped ring into said groove and said ange against the inner wallof said sleeve, said means including a flanged pressure ring extend' inginto the gap between' said pipe and said sleeve,

e and into contact with said packing ring, pairs of slits in said sleeveand tangential indenturei, registering with said slits, in said flangedpressure ring, and Wedges extending through said slits and indentures. d

JOHAN FRIEDRICH KHNKE.

